General Pathology Practice Questions

Q: Which of the following is considered a hypercoagulable factor?

Factor V Leiden. ***Factor V Leiden*** - Factor V Leiden is a **mutation** of the Factor V gene, leading to a hypercoagulable state due to **increased resistance** to activated protein C [1]. - This condition substantially raises the risk of **venous thromboembolism**, making it a critical factor in thrombotic events [1]. *Protein S* - Protein S functions as a **cofactor** for activated protein C, promoting inactivation of coagulation factors and thus **decreasing** clot formation. - Deficiency in Protein S can lead to thrombosis, but it is not inherently a **hypercoagulable factor**. *Protein C* - Protein C is activated by the thrombin-thrombomodulin complex, which helps to **regulate coagulation** and **prevent clotting**. - It is protective against thrombosis, and its deficiency can predispose to clot formation, but it does not act as a hypercoagulable factor itself. *Antithrombin III* - Antithrombin III is a **natural anticoagulant** that inhibits thrombin and other proteases of the coagulation cascade, thus preventing excessive clotting. - Its deficiency also leads to hypercoagulability, but it is not classified as a hypercoagulable factor. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 133-134.

Q: What is the characteristic feature of thermal injury in tissues?

Coagulation necrosis of tissue proteins. ***Coagulation necrosis of tissue proteins*** - **Thermal injury** causes cell proteins to **denature** and coagulate, leading to cell death and the formation of a solid, opaque mass. - This process is characteristic of **coagulation necrosis**, where the basic tissue architecture is preserved for a period due to enzyme inactivation. *Irregular margins due to thermal damage* - While thermal damage can result in irregular margins, this is a **gross morphological feature** rather than the fundamental cellular and biochemical characteristic of thermal injury. - **Coagulation necrosis** is the underlying histological change that explains the tissue's appearance. *Ruptured blood vessels or clotted blood* - **Ruptured blood vessels** and **clotted blood** can occur with thermal injury, particularly in severe burns, but these are secondary effects or complications, not the primary "characteristic feature" of the tissue injury itself. - The fundamental characteristic is the **denaturation** of cellular proteins. *Smooth tissue margins due to healing* - **Smooth tissue margins** are typically associated with the **healing process** (e.g., re-epithelialization, scar formation) much later in the course after the initial thermal injury. - This option describes a **late-stage reparative process**, not the immediate characteristic feature of acute thermal tissue damage.

Q: What is the first stage of tissue damage in an alkali burn?

Liquefactive necrosis. ***Liquefactive necrosis*** - Alkali burns cause **liquefactive necrosis** as the **first stage of tissue damage**, which is the hallmark mechanism of alkali injury. - The alkali reacts with tissue lipids causing **saponification of fats** and **protein denaturation**, resulting in dissolution and liquefaction of tissues. - This liquefactive process allows the alkali to **penetrate deeper** into tissues progressively, causing ongoing and extensive damage as it continues to dissolve cellular structures. - This is why alkali burns are generally more severe than acid burns, despite potentially appearing less dramatic initially. *Coagulation necrosis* - **Coagulation necrosis** is characteristic of **acid burns**, not alkali burns. - Acids cause proteins to coagulate and denature, forming a **protective eschar** (dry, hard layer). - This eschar acts as a barrier that **limits penetration** of the acid into deeper tissues, often resulting in less extensive damage compared to alkali burns. *Tissue necrosis* - **Tissue necrosis** is a general term for cell death but does not specify the mechanism or type. - While liquefactive necrosis is indeed a type of tissue necrosis, this option is **too broad and non-specific** to answer what the first stage of damage is. - The question requires identification of the specific **pattern or mechanism** of necrosis, not just a general acknowledgment that cell death occurs. *Full thickness necrosis* - **Full-thickness necrosis** describes the **extent or depth** of tissue damage (involving all layers), not the mechanism or type of cellular injury. - While severe alkali burns can eventually progress to full-thickness necrosis, this is a **consequence of progressive liquefaction**, not the initial cellular process. - This term describes "how deep" rather than "how" the damage occurs.

Q: Neurofibromatosis shows which of the following mode of inheritance ?

AD. ***AD*** - **Neurofibromatosis type 1 (NF1)** and **Neurofibromatosis type 2 (NF2)** are both classic examples of **autosomal dominant (AD)** inheritance [1]. - This means that only one copy of the altered gene (on a non-sex chromosome) is sufficient to cause the disorder, and there is a **50% chance** of passing the condition to each child [1]. *AR* - **Autosomal recessive (AR)** disorders require two copies of the altered gene (one from each parent) for the condition to manifest [1]. - Examples include **cystic fibrosis** and **sickle cell anemia**, which have a different pattern of inheritance than neurofibromatosis. *X linked dominant* - **X-linked dominant** disorders are caused by a mutation on the X chromosome, where only one copy of the mutated gene is needed for the condition to appear [1]. - These disorders typically affect females more often than males and show a specific inheritance pattern through X chromosome transmission, which is not seen in neurofibromatosis. *X linked recessive* - **X-linked recessive** disorders are also caused by mutations on the X chromosome but typically affect males more severely as they only have one X chromosome [1]. - Females are often carriers, and the inheritance pattern differs significantly from the clinical presentation and genetic transmission of neurofibromatosis. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 53-54.

Q: Which of the following statements is true regarding hemophilia inheritance?

Females can be carriers, and males are typically affected.. ***Females can be carriers, and males are typically affected.*** - Hemophilia is an **X-linked recessive disorder**, meaning the gene responsible is located on the X chromosome. - Males have only one X chromosome, so if they inherit the affected gene, they will express the disorder, while females have two X chromosomes, allowing them to be **asymptomatic carriers** if only one X chromosome carries the mutation. - This option accurately describes the **typical inheritance pattern** where carrier females (heterozygous) transmit the condition to their sons who become affected. *Females can be carriers, and some males may be unaffected.* - While this statement is technically true, it is less precise for describing hemophilia inheritance patterns. - The focus on "some males may be unaffected" is less informative than emphasizing that males who inherit the mutation are **typically affected**, which is the key clinical characteristic. - This option doesn't emphasize the primary pattern that makes X-linked recessive inheritance clinically significant. *Males are carriers, and females are typically affected.* - Males cannot be carriers for X-linked recessive disorders; if a male carries the gene on his single X chromosome, **he will be affected**, not a carrier. - **Females are rarely affected** as they would need to inherit the mutated gene from both parents (an affected father and a carrier/affected mother), which is uncommon. - This statement reverses the actual inheritance pattern. *All males are affected, and females cannot be carriers.* - It is incorrect that all males are affected; only males who **inherit the specific defective X chromosome** will be affected. - Females **can and often are carriers**, as they possess two X chromosomes, and one can carry the mutated gene while the other compensates through X-inactivation (lyonization).

Q: Which of the following genes primarily promotes apoptosis (programmed cell death)?

Bax. ***Bax*** - **Bax** is a **pro-apoptotic gene** that actively promotes programmed cell death by forming channels in the mitochondrial outer membrane, leading to cytochrome c release and activation of caspases [1]. - It is a key member of the Bcl-2 family and plays a critical role in the **intrinsic apoptotic pathway** [2]. - Unlike the other options, Bax **promotes** rather than inhibits apoptosis [1]. *Bclx* - **Bcl-xL** is an **anti-apoptotic** gene that **inhibits** cell death by preventing the activation of pro-apoptotic proteins like Bax [1]. - It maintains mitochondrial membrane integrity, thereby **blocking** apoptosis [1]. *Mcl* - **Mcl-1** (Myeloid cell leukemia sequence 1) is an **anti-apoptotic** gene belonging to the Bcl-2 family [1]. - Its primary role is to **inhibit** apoptosis and promote cell survival by sequestering pro-apoptotic proteins [1]. *Bcl2* - **Bcl-2** (B-cell lymphoma 2) is the prototype **anti-apoptotic** gene that **prevents** programmed cell death [3]. - It functions by binding to and inhibiting pro-apoptotic members of the Bcl-2 family, thus maintaining cell viability and **opposing** apoptosis [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 64-67. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311.

Q: Factor V Leiden thrombophilia is caused by mutation in which of the following factors?

Factor V (Leiden mutation). ***Factor V*** - Leiden thrombophilia is specifically caused by a **mutation in the Factor V gene**, leading to resistance to activated protein C [1]. - This results in an increased risk of **venous thromboembolism** due to uncontrolled coagulation [1]. *Factor X* - Factor X is crucial for the coagulation cascade but is **not implicated in Leiden thrombophilia**; it does not involve a mutation. - Deficiencies or dysfunctions in Factor X lead to different bleeding disorders rather than thrombophilia. *Factor VII* - Factor VII deficiency typically results in **hemorrhagic conditions**, and does not relate to the **thrombotic risks** of Leiden thrombophilia. - It involves **extrinsic pathway coagulation**, which is distinct from the resistance seen in Factor V Leiden. *Factor IX* - Factor IX is associated with **Hemophilia B** and does not play a role in Leiden thrombophilia. - Its mutation results in bleeding tendencies, contrasting with the **thrombotic risk** of Leiden thrombophilia. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 133-134.

Question 1

Which of the following is considered a hypercoagulable factor?

Accepted Answer

Factor V Leiden

Answer

Protein C

Answer

Protein S

Answer

Antithrombin III

Question 2

What is the characteristic feature of thermal injury in tissues?

Accepted Answer

Coagulation necrosis of tissue proteins

Answer

Ruptured blood vessels or clotted blood

Answer

Irregular margins due to thermal damage

Answer

Smooth tissue margins due to healing

Question 3

What is the first stage of tissue damage in an alkali burn?

Accepted Answer

Liquefactive necrosis

Answer

Coagulation necrosis

Answer

Tissue necrosis

Answer

Full thickness necrosis

Question 4

Neurofibromatosis shows which of the following mode of inheritance ?

Accepted Answer

AD

Answer

AR

Answer

X linked dominant

Answer

X linked recessive

Question 5

Which of the following statements is true regarding hemophilia inheritance?

Accepted Answer

Females can be carriers, and males are typically affected.

Answer

Females can be carriers, and some males may be unaffected.

Answer

Males are carriers, and females are typically affected.

Answer

All males are affected, and females cannot be carriers.

Question 6

Which of the following factors play a major role in the initiation of thrombus formation?

Accepted Answer

Endothelial injury

Answer

Vasoconstriction

Answer

Coagulation cascade activation

Answer

Platelets activation

Question 7

Which of the following genes primarily promotes apoptosis (programmed cell death)?

Accepted Answer

Bax

Answer

Bclx

Answer

Mcl

Answer

Bcl2

Question 8

Factor V Leiden thrombophilia is caused by mutation in which of the following factors?

Accepted Answer

Factor V (Leiden mutation)

Answer

Factor X

Answer

Factor VII

Answer

Factor IX

Question 9

What is the key pathophysiological difference between acid and alkali injuries in terms of tissue necrosis?

Accepted Answer

Alkali injuries cause liquefactive necrosis

Answer

Acid injuries cause coagulative necrosis

Answer

Alkali injuries lead to deeper tissue damage

Answer

Acid injuries are less severe than alkali injuries

Question 10

Which molecule is primarily responsible for nuclear fragmentation during apoptosis?

Accepted Answer

Caspases

Answer

Apaf - 1

Answer

Oxygen free radicals

Answer

Endonuclease G

General Pathology — MCQs

General Pathology — MCQs

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